Molded metallic article and method of making the same.



W. R. WHITNEY.

MOLDED METALLIC ARTICLE AND METHOD OF MAKING THE SAME.

APPLICATION FILED OCT. 12, 1910.

1,121,960. 1 Patented Dec. 22,1914.

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WILLIS R. WHITNEY, OF SCHENECTADY, NEW YORK, ASSIGNOR T0 GENERALELECTRIC COMPANY, A CORPORATION OF NEW YORK.

MOLDED METALLIC ARTICLE AND METHOD OF MAKING THE SAME.

Specification of Letters Patent. Patented De 22, 1914 Application filed.October 12, 1910. Serial No. 583,6.

To all whom it may concern:

Be it known that I, VVILLIs It. WHITNEY, a clt zc-n of the UnitedStates, resldin at Schenectady, county of Schenectady, tate ings forshafts and the like, and it involves the use of a sulfid of a metal ofthe chromium group, particularly the sulfid of molybdenum, as alubricant with the material constituting the main body of the bearing,for example, soft metalsuch as copper or tin.

The accompanying drawing shows a brush for a dynamo electric machine asillustrating my invention.

While I do not any particular manner of introducing the sulfidlubricating material, I have found it to be advantageous to incorporatethe same intimately with the metal, carbonaceous material or othersubstances constituting the brush or bearing.-

The following specific examples will serve to illustrate my invention.

For the manufacture of a metallic brush,

. or hearing, a mixture consisting for example Upon cooling the of 1000parts of black copper oxid, C11 0, 127 parts of tin oxid, SnO. 80 partsof carbon or graphite and in the neighborhood of 65 parts of molybdenumsulfid MoS is finely powdered, for example, by being pulverized in aball mill. This mixture is placed in about eight hours to a. temperatureof 650 to 7 00" C. At the end of this time a large part of the metallicoxids have been reduced by the graphite to the metallic state, but themixture should still contain some unreduced oxid varying perhaps from .5to 2.5%. mixture is put through a 100 mesh sieve and is then compressedinto desired form. The compressed articles are then packed in charcoalso as to exclude airthe sulfid being associated desire to be limited toI a suitable retort and heated for they carbon. Alloyage takes placebetween the copper and tin and thereby causes the article to beconsolidated. The proportion of sulfid to the other materials will vary,of course, with the use for which these materials are intended. In' the.specific example ust given the proportion of molybdenum and sulfur aselementary constituents in the finished product will be in theneighborhood of 6%.

It is not necessary, of course, that the molybdenum sulfid shall beincorporated with the metallic material while the latter is in the oxidform, but this particular example is merely given as one specific way ofmaking the bearing material. The sulfid can be mixed with the finelydivided metal or metals and these can later be consolidated byanydesired process, for example, by allovage as is the case in the examplegiven.

The sulfid of molybdenum, or other metal of the chromium group, maylikewise be added with advantage to carbon brushes. For example, thefinelv divided sulfid of mo ybdenum is intimately mixed with powderedcoke, lamp black or other carbonaceous material with a suitable bindersuch as tar or pitch. These materials may be mixed with the binder bykneading or working them while hot. or better still, bv grinding them ina liquid solvent. for .the binder, such as benzol. When the lattermethod is used the benzol is evaporated after the binder has beenthoroughly distributed, and the caked mass is pulverized. In either casethe mixbinder, leaving the sulfid uniformly distributed throughout themass. While I have indicated the sulfid of molybdenum as beingparticularly suited for the purpose of my invention, other sulfids ofother metals of the chromium group such as sulfid of tungsten likewisecan be used.

I What I claim as new and desire to secure by Letters Patent of theUnited States is: 1-. As an article of manufacture, a brush for dvnamoelectric machines consisting of metallic material and a sulfid ofmolybdenum. I

2. As an article of manufacture, a brush for dynamo electric machinescomprisin copper, metallic material alloyable therewith and molybdenumsulfid.

3. An article of manufacture comprising a shaped homogeneous bodyconsisting largely of soft metal and a uniformly distributed lubricatingmaterial containing sulfur and molybdenum.,

4. An article of manufacture comprising a shaped current collectorcontaining copper, a soft metal readily alloyable with copper,molybdenum constituents.

5 An article of manufacture comprising a molded body consisting largelyof copand sulfur as elementary 1,121,oeo

per and a lubricating material uniformly distributed therethroughcontaining sulfur andmolybdenum as constituents.

6. The process which consists in mixing metallic oxid, carbomandmolybdenum sulfid, heating to reduce'most vof said oXid, molding themixture and heating at a temperature of about 650 to 700 C. untilconsolidation has taken place. I

In witnesswhereof, I' have hereunto set my hand this 11th day ofOctober, 1910.

WILLIS R. WHITNEY; Witnesses: v

BENJAMIN B. HULL, .HELEN ORFORD.

